Here’s a short breakdown of the findings:

Key findings:

1. Overall accuracy:
   • Fitness trackers are most accurate for heart rate tracking (76.35%), followed by step count (68.75%)and energy expenditure (56.63%).
   • The Apple Watch leads in accuracy for heart rate (86.31%) and energy expenditure (71.02%), while Garmin excels in step count tracking (82.58%).
2. Step count accuracy:
   • Garmin (82.58%), Apple (81.07%), and Fitbit (77.29%)show strong accuracy.
   • Jawbone (57.91%)and Polar (53.21%) are less reliable, often mistaking other movements for steps.
3. Heart rate accuracy:
   • Apple Watch (86.31%)and Fitbit (73.56%) perform well.
   • Garmin (67.73%)and TomTom (67.63%) are less accurate, with reduced precision for darker skin tones due to reliance on light sensors.
4. Energy expenditure accuracy:
   • Only the Apple Watch (71.02%)provides strong accuracy.
   • Other brands like Fitbit (65.57%), Jawbone (50.23%), and Polar (53.21%)show moderate accuracy, while Garmin (48.05%) is the least accurate.

Takeaway

While fitness trackers like the Apple Watch and Garmin offer strong accuracy for specific metrics, their overall reliability is moderate (67.40%).

To prevent health anxiety, users should interpret data cautiously, especially for energy expenditure and step counts, and avoid over-reliance.